michael@0: function noop() {}
michael@0: 
michael@0: function run_test() {
michael@0:   var contentHandler = {
michael@0:     attrs: null,
michael@0:     reset: function() {
michael@0:         this.attrs = [];
michael@0:     },
michael@0:     startDocument: noop,
michael@0:     endDocument: noop,
michael@0: 
michael@0:     startElement: function startElement(aNamespaceURI, aLocalName, aNodeName, aAttrs) {
michael@0:       for (var i = 0; i < aAttrs.length; i++) 
michael@0:         this.attrs.push(aAttrs.getQName(i));
michael@0:     },
michael@0: 
michael@0:     endElement: noop,
michael@0:     characters: noop,
michael@0:     processingInstruction: noop,
michael@0:     ignorableWhitespace: noop,
michael@0:     startPrefixMapping: noop,
michael@0:     endPrefixMapping: noop
michael@0:   };
michael@0: 
michael@0:   const nsISAXXMLReader = Components.interfaces.nsISAXXMLReader;
michael@0:   const src = "<a:x xmlns:a='foo' y='bar'/>";
michael@0:   const NS_PREFIX = "http://xml.org/sax/features/namespace-prefixes";
michael@0: 
michael@0:   var saxReader = Components.classes["@mozilla.org/saxparser/xmlreader;1"]
michael@0:                             .createInstance(nsISAXXMLReader);
michael@0:   do_check_false(saxReader.getFeature(NS_PREFIX));
michael@0:   saxReader.contentHandler = contentHandler;
michael@0:   contentHandler.reset();
michael@0:   saxReader.parseFromString(src, "application/xml");
michael@0:   do_check_eq(contentHandler.attrs.length, 1);
michael@0:   do_check_eq(contentHandler.attrs[0], "y");
michael@0: 
michael@0:   saxReader.setFeature(NS_PREFIX, true);
michael@0:   do_check_true(saxReader.getFeature(NS_PREFIX));
michael@0:   contentHandler.reset();
michael@0:   saxReader.parseFromString(src, "application/xml");
michael@0:   do_check_eq(contentHandler.attrs.length, 2);
michael@0:   do_check_eq(contentHandler.attrs[0], "xmlns:a");
michael@0:   do_check_eq(contentHandler.attrs[1], "y");
michael@0: 
michael@0:   saxReader.setFeature(NS_PREFIX, false);
michael@0:   do_check_false(saxReader.getFeature(NS_PREFIX));
michael@0:   contentHandler.reset();
michael@0:   saxReader.parseFromString(src, "application/xml");
michael@0:   do_check_eq(contentHandler.attrs.length, 1);
michael@0:   do_check_eq(contentHandler.attrs[0], "y");
michael@0: }